Thursday, 9 March 2017

630m WSPR again

Results 630m WSPR RX till now.
It gets boring, 630m again. I got 35th place at PE1ITR's WSPR challenge. That's average. See results here from 5-3-2017. Not impressive. Max. distance was southern Italy 1600km. I know for sure my horizontal loop is not the ideal receive antenna for MF. If I want to improve I should make a dedicated antenna.

I attended a clubmeeting lately were PA2DTA showed some kind of direction finding receiver. It was capable of receiving in what I think the medium wave range. One of the things he showed was the difference between a attached longwire and a small dipole made with windings on a ferrite rod. I have to admit the dipole received a lot better as it didn't receive electric noise. However it was directional and that is nice to track a station but isn't when receiving WSPR signals around you.

However I found a commercial made MW antenna somewhere on the attick. So I thought I give it a test. I just have it on my radiodesk inside the house that is. And indeed the medium wave stations came in very clear but signals were significant less. All the noise received with the big loop was gone.


Would I receive WSPR signals on 474,2KHz? Yes, not as many but I did! I think this design could be much better as just a single wire outside the house. Thinking of a bigger loop outside the house. The only problem is the directivity. If you call it a problem of course as you are able to null out the QRM/QRN. It would be nice to experiment with it in the future. It also shows that you are able to pull WSPR signals out of the noise with a simple antenna inside the house on the 630m band.

4 comments:

  1. Hoi Bas, leuk die experimenten op MF. G3XBM was vorig jaar daar ook actief mee. Toevallig zit ik vanmiddag ook op WSPR MF. Vorige week heb ik nog een MF WSPR testje gedaan. Verste afstand was 909km LA8AV. Antenne was gewoon de EndFed voor 10-40mb zonder ATU. Komende week hang ik mijn 16,2m enkel draad antenne weer op en kijken of die beter is. Leuke experiment met die ferrietkern antenne al is die ook super richtingsgevoelig. Experimenteerze en succes. 73 Hans, PE1BVQ

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    1. Hallo Hans, ik denk met jouw storingsniveau dat je betere resultaten zou kunnen krijgen met een ferrietstaaf antenne of zo een draadloop zoals ik gebruik. Ik zit nu ook te denken aan een mini whip zoals PA3FYM ontworpen heeft. Voordeel is dat ze alleen een elektro magnetisch veld ontvangen en minder storingen oppikken. Ik heb nog te veel experimenten om te doen anders was ik er op door gegaan. Misschien een andere keer. 73, Bas

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  2. Hallo Bas, ik ben ook vanavond gaan luisteren met WSPR op 630 meter. Mijn EndFed getuned op 160 m en toen gaan luisteren. Beste afstand was 1203 km LA2XPA best grappig heb nooit eerder geluisterd op 630 meter. 73 Paul PC4T

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    1. Super Paul, ik luister momenteel nog steeds met de binnen antenne. Misschien dat ik in de toekomst nog eens verder ga kijken naar verbeteringen. 73, Bas

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Thanks for your comment. Bedankt voor je reactie. 73, Bas